2018 Mazda 3 Service and Repair Manual

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Covers all 2018 3 trims — Touring Hatchback 4-Door, I Touring Sedan 4-Door, GS Sedan 4-Door +9 more ·
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2018 Mazda 3 service and repair manual — a detailed, factory-style reference for maintenance, diagnostics, and repair. Use it to confirm correct procedures, specifications, and system coverage before you start work.

Designed for technicians and DIY owners, this manual helps you diagnose issues correctly, follow proven repair steps, and use wiring diagrams and system sections to track faults faster.

What’s included

  • Step-by-step repair procedures and service information
  • Specifications and reference data (where provided)
  • Electrical diagnostics with wiring diagrams
  • Coverage across major systems: engine, transmission/driveline, brakes, steering, suspension, HVAC, and more

Trims covered

  • Touring Hatchback 4-Door
  • I Touring Sedan 4-Door
  • GS Sedan 4-Door
  • GT Sedan 4-Door
  • SE Sedan 4-Door
  • Touring Sedan 4-Door
  • S Sedan 4-Door
  • Grand Touring Hatchback 4-Door
  • Grand Touring Sedan 4-Door
  • I Touring Hatchback 4-Door
  • G Sedan 4-Door
  • i Sedan 4-Door
  • Sport Sedan 4-Door
  • S Hatchback 4-Door
  • s Grand Touring Sedan 4-Door
  • Sport Hatchback 4-Door
  • s Grand Touring Hatchback 4-Door
  • GX Sedan 4-Door

Engines covered

  • 2.5L 2488CC 152Cu. In. l4 GAS DOHC Naturally Aspirated
  • 2.0L 1998CC 122Cu. In. l4 GAS DOHC Naturally Aspirated

Index / Table of contents

  • Body
  • Brakes
  • Chassis Electrical
  • Driveline
  • Engine Cooling
  • Engine Electrical
  • Engine Mechanical
  • Engine Performance & Emission Controls
  • Fuel System
  • General Information & Identification
  • Heating, Ventilation, & Air Conditioning
  • Hybrid & Electric Vehicle Systems
  • Steering
  • Suspension
  • Transmission, Clutch, & Transfer Case
  • Wiring Diagrams
NHTSA #19V27200004/04/2019Component: VISIBILITY:WINDSHIELD WIPER/WASHER

Mazda North American Operations (Mazda) is recalling certain 2016-2018 Mazda3 vehicles. A defective windshield wiper relay may cause the windshield wipers to become inoperative, reducing the driver's visibility.

Consequence

Reduced visibility while driving can increase the risk of crash.

Remedy

Mazda will notify owners, and dealers will replace the front body control module with a new module which uses an improved wiper relay design, free of charge. The recall began May 7, 2019. Owners may contact Mazda customer service at 1-800-222-5500, option 4. Mazda's number for this recall is 3219D.

NHTSA #17V74500021/11/2017Component: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM

Mazda North American Operations (Mazda) is recalling certain 2018 Mazda3 vehicles, equipped with an incorrect exhaust valve spring. The incorrect exhaust valve spring may fail while driving, potentially causing an engine stall.

Consequence

An engine stall can increase the risk of a crash.

Remedy

Mazda will notify owners, and dealers will inspect the engines and replace any incorrect exhaust valve springs, free of charge. The recall is expected to begin January 20, 2018. Owners may contact Mazda customer service at 1-800-222-5500. Mazda's number for this recall is 1717K.

NHTSA #21V87500012/11/2021Component: FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP

Mazda North American Operations (Mazda) is recalling certain 2018 Mazda3, Mazda6, 2019 CX-3, 2018-2019 MX-5, CX-5, CX-9, and 2019-2020 Mazda2 vehicles. The impeller inside the low-pressure fuel pump may crack and deform, potentially causing the fuel pump to fail.

Consequence

Fuel pump failure may cause an engine stall, increasing the risk of a crash.

Remedy

Dealers will replace the fuel pumps, free of charge. Owner notification letters were mailed July 18, 2022. Owners may contact Mazda customer service at 1-800-222-5500 Option 4. Mazda's number for this recall is 5321K.

NHTSA #23V48700014/07/2023Component: BACK OVER PREVENTION: SENSING SYSTEM: CAMERA

Mazda North American Operations (Mazda) is recalling certain 2014-2018 Mazda3 and 2016-2021 CX-3 vehicles. The rearview camera image may not display properly by showing a flickering or distorted image.

Consequence

A rearview camera that does not display properly can reduce the driver's rear view, increasing the risk of a crash or injury.

Remedy

Dealers will inspect and replace the rearview camera, as necessary. In addition, dealers will install a wiring harness fastening seal. All repairs will be performed free of charge. Interim notification letters, notifying owners of the safety risk, were mailed September 13, 2023. Final owner letters for affected models and model years in the states of CT, MA, MD, NJ, NY, PA and VA were mailed August 14, 2024. The remaining owner notification letters will be mailed at a future date, anticipated on or before May 1, 2025. Owners may contact Mazda customer service at 1-800-222-5500, Option 6. Mazda's number for this recall is 6023G.

TSB #11032104

DESCRIPTION Some vehicles may require the replacement of a damaged VIN plate or vehicle certification label. To obtain a replacement VIN plate (bulkhead-mounted and visible through the lower-left area of the windshield), contact DAG (Dealer

TSB #11032103

This Service Alert supersedes the previously issued SA listed below: The changes are noted in Red. SA-011/24 02/12/24, 06/06/24, 07/29/24 DESCRIPTION Mazda has developed factory recommended scheduled maintenance services that support all ma

TSB #11032101

This Service Alert supersedes the previously issued M-Tip(s) listed below. The changes are noted in Red text. MT-002/19 09/30/19 and 12/19/19 DESCRIPTION If an engine assembly is replaced after a catastrophic internal mechanical failure, cl

TSB #11032100

This Service Alert supersedes the previously issued SAs and bulletin(s) listed below: The changes are noted below in red. SA-010/23 02/09/23 DESCRIPTION Some customers may experience one or more electrical malfunctions after a vehicle body

TSB #11032019

This Service Alert supersedes the previously issued M-Tip(s) listed below. The changes are noted in Red text. MT-003/22 03/02/22 DESCRIPTION Some customers may complain about a tapping or knocking noise coming from the rear seat after fuel

TSB #11032003

This bulletin supersedes the previously issued bulletin(s) listed below. The changes are noted in Red. 01-008/23 06/05/23 Some vehicles may exhibit rattling noises from the engine compartment and oil leakage from the drive belt auto tension

TSB #11030636

This Service Alert supersedes the previously issued SA(s) and TSB(s) listed below: The changes are noted in Red. SA-035/24 05/31/24 DESCRIPTION There is a concern that some water pumps are being replaced that are not faulty, due to signs of

TSB #11028133

There are currently 2 methods for cutting a new auxiliary key blank. A. Auxiliary Key Trace Cut Method B. Auxiliary Key Code Cut Method 2019 and newer models require a 10-digit key code to accurately cut keys 5-digit codes CANNOT be provide

Showing the 8 most recent of 239 technical service bulletins on file with NHTSA.

03/26/20Component: UNKNOWN OR OTHER,ENGINECrash reported2 injured1 fatalities

ON 2/14/19 BETWEEN 2:30 AND 3 P.M., MY MOTHER (MELISSA DODSON) WAS INVOLVED IN A FATAL CAR ACCIDENT WITH ANOTHER VEHICLE (A 2004 GMC ENVOY) THAT RESULTED IN BEING DOA. SHE WAS DRIVING A 2018 MAZDA MAZDA3 SPORT FOUR DR AND TRAVELING WESTBOUND ON EAST HANOVER RD IN GRAHAM, NC AT THE TIME OF THE ACCIDENT. ACCORDING TO THE UNSUBSTANTIATED POLICE REPORT, IT STATED THAT MY MOTHER'S CAR VEERED/CROSSED THE DOUBLE YELLOW LINE BEFORE IMPACT. HOWEVER, THE ENVOY WAS REPORTEDLY DOING 55 MPH UPON ENTERING THE "S" CURVE SECTION OF THE NARROW 35 MPH TWO-LANE ROAD (WHICH CONTRIBUTED TO THE CRASH). IN MY MUST

09/25/20Component: VISIBILITY/WIPERCrash reported3 injured

ON SEPTEMBER 13TH, 2018, I WAS DRIVING OUT OF THE STATE, DURING A ROAD TRIP ON MY WAY FROM CANNON BEACH TO PORTLAND IN THE STATE OF OREGON AROUND 9PM, I WAS DRIVING MY 2018 MAZDA 3 ON NORTH OF HIGHWAY I-5 WHEN RAIN BEGAN DURING RUSH TRAFFIC. I HAD THE AUTOMATIC FRONT WIPERS ON AND THEY BEGAN PERFORMING THEIR FUNCTION FOR ABOUT 3 MINUTES WHEN ALL OF A SUDDEN THEY WENT OFF. RAIN GOT HEAVIER AND EVEN AFTER TRYING TO ACTUATE THE WIPER LEVER TO HIGH SPEED, THE FRONT WIPERS FAILED TO START WORKING AGAIN. I WAS IN THE MIDDLE LANE OF A THREE-WAY ROAD AND WAS HAVING A HARD TIME TRYING TO SEE THROUGH TO

07/18/20Component: ELECTRICAL SYSTEM,LANE DEPARTURE,BACK OVER PREVENTIONCrash reported

In 2023, the reverse camera would either flicker or completely shut off (displaying a blank screen) while the reverse gear is engaged. While reversing the vehicle to park onto the property the rear camera image failed to display in the vehicle, leading to a collision with the curb. The limited visibility out of the rear windshield for the Mazda 3 leads to a typical driver relying on the camera display to show obstructions not visible through the rear and side mirrors. This failure lead to the car impacting the curb and the passenger being shocked that the car was in an accident. If that was ch

06/24/20Component: SERVICE BRAKESCrash reported

VEHICLE WAS OFF AND UNATTENDED IN PARKING LOT:MANUAL TRANSMISSION WHICH I'VE DRIVEN MY WHOLE LIFE & I'M NO SPRING CHICKEN. LIVE IN FLAT CITY WHERE HILL/ROLLING BACK HAS NEVER BEEN AN ISSUE. CAR HAS ELECTRIC PARKING BRAKE. 1 DAY A YEAR INTO THE LEASE, WAS PARKED @A PUMP@TGAS STATION &WHEN CAME OUT,CAR HAD MOVED/ROLLED BACK. SHOCKINGLY I THOUGHT I MESSED UP/MIGHT'VE FORGOTTEN2 ENGAGE PARKING BRAKE, DESPITE IT BECOMING 2ND NATURE. THANKED GOD DIDN'T ROLL BACK INTO ANYTHING/ANYONE, VOWED 2 BE XTRA MINDFUL/CAREFUL.TURNS OUT NO MATTER HOW CAREFUL/MINDFUL I'VE BEEN,JUST THE OTHER DAY IT HAPPENED AGAI

03/14/20Component: STEERINGCrash reported

COMING OFF THE BQE IN NYC, ON A SHARP TURN EXIT RAMP LOST STEERING CONTROL. THE CAR VEERED SHARPLY TO THE LEFT INTO THE BARRIER CAUSING ALL THE SIDE AIRBAGS TO DEPLOY. LUCKY IT WAS AT A LOW SPEED SO NOBODY WAS HURT AND VERY MINOR BODY DAMAGE CAUSED. I HAD MY SON IN THE CAR, THE AIRBAG SAVED HIM FROM HITTING HIS HEAD INTO THE WINDOW. THE TOWTRUCK DRIVER SAID IT LOOKED AS IF THE STEERING FAILED BECAUSE THE STEERING COLOM DETACHED.

02/21/20Component: STEERINGCrash reported

THE CAR WAS BEING DRIVEN BY MY WIFE IN THE RIGHT LANE ON 3 LANE WIDE I-95 SOUTH IN CONNECTICUT AT NORMAL HIGHWAY SPEEDS, APPX 55-60 MPH. ACCORDING TO HER, THE CAR LURCHED LEFT AT ALMOST 90 DEGREES AND IT WAS AS IF SHE HAD NO CONTROL OVER THE STEERING AND THE WHEEL WAS NOT TURNING LIKE NORMAL POWER STEERING TURNS THE WHEEL. SHE CROSSED OVER ALL THREE LANES, AND IT CRASHED INTO THE CENTER DIVIDER SO THAT THE LEFT DRIVER'S SIDE WAS DAMAGED FROM FRONT TO BACK. SHE SAID IT WAS AS IF SHE HAD NO STEERING CONTROL AT ALL. FORTUNATELY SHE WAS NOT INJURED. BUT THE UNEXPLAINED LOSS OF STEERING CONTROL SOU

03/24/20Component: VISIBILITY/WIPER

While I was driving on the highway, I went to use my front wipers and there was no response when trying to active them. The rear wiper, front and rear washer fluid sprayers all worked. No warning lights or other signs of failure were present. I took the car to a local repair shop and they diagnosed it as a bad Body Control Module. Once the module was replaced and reprogrammed, the wipers worked as intended. Safety Recall 3219D describes the issue I had perfecly. My VIN is out of the range of this recall but if I had the same issue as this recall, there might be other bad parts out there and th

02/02/20Component: ELECTRICAL SYSTEM,UNKNOWN OR OTHER

The center dashboard information screen developed "spider cracks" and got opaque in the corners of the screen. The screen would change functions / jump around commands without being touched while driving ( from NAV to radio, change radio stations etc) - apparently called 'Ghost Touch". Mazda has been aware of the defect for some time and issued a TSB ( and settled a class action lawsuit) but we never received any notification. The dealer offered no assistance as the car was out of warranty . We paid several hundred dollars to replace the screen as the car was becoming undriveable.

Showing the 8 most serious of 106 complaints filed with NHTSA.

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